Anaesthetizing apparatus



Aug. 4, 1931.

" Filed June 5,1192@ 5 sheets-sheet 1 Tay In verz for:

J. ,n.-YHEIDBRINK 1,817,485 AN/asTHETImNG APPARATUS Aug. 4;' l1931` I Filed June 5. 41925i ioe l ITG Aug- 4, 1931- J. A. HEIDBRlNK L 1,817,485

ANESTHETI Z ING APPARATUS Fi1ed.June 5, 1928 5 Sheets-Sheet 5 Patented Aug. 4, 1931 ruN-iTED1sTATfEs JAY fA. HEID'BRINK. or MINNEAPOLIS; MINNESOTA' A'NESTHETIZING APPARATUS AppiiauonfuefiJuneaieesl yseriai Nb. asaeis.

My invention relates to l anaesthetizing 'apparatus, andan object in general is to provide an improvedv apparatus forfdelivering 3.' Nitrous oxid alone' may be delivered to' the inhalerand to the gas bag.

4. Nitrous oxid alone maybe delivered toV 2U the inhaler Without any of itf passing" to the gas bag. l

5. Oxygen alone mayl be delivered to the inhaler and to the gas 6. Oxygen alone maybe delivered to the 25 inhalervvitlioutany of it passing to the gas The gas containers on this 'sideo'f tlern'aclif bag. Y Another object is to provide means for de livering gases inthe above 4mentioned'Ways infconibi'nation Withl means for controlling 315 vand registering the pressure under" Whic'zh'"` the gases are delivered,

The full ob 'e'ct s and advantages oifin'yy vention Will appear in connection vwith the j detailed 'description thereof. and the novel 'features of my" inventive 'ide'afvvill befparj,

ticularly pointed out in the claims. f

tion.-

Figfl is atop plan vie'vvof airaneestlietiZt-v ing apparatusprovide'divith my invention Fig. 2 is a vievv in verticalsection on the line delivered fromV inde- Q numeralil() in Figs??? lthe cam device. moved into pdslitioif," 'r Figs. 7, 8, and 9 are fragmentary 4vievv's in` horizontal section slioivingfthe cani devicex moved -into still diiferentipositions. Figf 10.

isv avvieiv in verticalsectionpn' 55" tion on the' inei'ifii o f'Fig@ As shovvn in the -dravvings"with refe particularly to 2, theremis'afcasting portionI tor re'ceivingthe uppeiffendoa siip-I porting standard *1 6.l Tivo arms 1' and` 20' extend out from opposite' sides ofthelc o', 12. Enlarged centralportions'22 o? cross bars`26` and 28 Iares'ecure'dtc'i theendsioi 65 the arms 11S aii'd`20 respectivelylj-1`he endsfo f are intended particularly fr llildentrous." oji'd' and one of vthemfi's "designatedbythe" 'Each'` of he cross 52:8(

' sidesY of the apparatusy are 'alike inf regardftoJy 8 ltlie control of the ysi'ipply of nitrous 0X`id .oxygen from 'the' gas' containers; a' d ailed description ofone side maybe consijderedfas" member 48, there is a sliding block 50 which carries a. iiber plug 51 on its upper side, this plug being adapted to engage the outlet end of a hole 52 extending down from the passageway 42. The block 50 is held upwardly by a spring 54 and may be depressed by means of a staplelike member 56, the upper end of which is engaged by the lower surface of a diaphragm 58 extending across the dished upper end of the member 22 so that a chamber 60 is formed below the diaphragm. This chamber as shown in Fig. 2 is provided with a safety valve 61. A spring 62 rests upon the upper surface of the diaphragm 58 and the tension of this spring may be regulated by a screw 63 threaded through the upper portion of the cap 47.

From the chamber 60, the gas passes through a tube 64 to a valve head device 66, this tube also being connected by a branch `tube 68 to a pressure gauge 70. As before stated, the contro-lling mechanisms are the same for both sides of the apparatus and hence there are two gauges 70, one for oxygen and the other for nitrous oxid. The valve head device 66 is secured over a mixing chamber 72 formed in the upper portion of the casting 12. As shown in Fig. 2, the tubes 64 lead into the valve head device which has an aperture 74 for passage of oxygen and an aperture 76 for passage of nitrous oxid, the latter aperture `being considerably larger than the former. It will be understood that by properly proportioning these apertures, the percentages of gases in the mixture may be determined. The passage of gases through these apertures into the mixing chamber is brought about or stopped at will be means of a disk valve 78 which is secured to the lower end of a stem 80 which is slidably mounted in the head. The upper end of the stem 80 as shown in Fig. 2 is threaded to receive a thumb nut y82 which may be turned so as to cause the valve 78 to close the apertures or to open them to the desired extent as indicated by a pointer 83 cooperating with graduation marks on top of the head l66 as shown in Fig. 1. As shown in Fig. 4, springs 84 interposed between the head 66 and the valve 78vserve to hold the latter open to the extent whichis permitted by the position of the nut 82 while a pin 85 prevents the stem 80 from turning in the head.

The forward portion of the casting 12 is formed into an enlarged hollow member 86. A'passageway between the mixing chamber 72 and the interior of the-hollow member 86 is controlled by a valve 88 having a stem 90 extending through a guide 91 and part way `into the member 86. A coiled spring 92V engaging the valve 88 and surrounding a cylindrical rearward extension 98 thereof serves to normally vhold this valve closed. The extension 98 is provided with perforations 95 for passage of gas.

he two gas chambers 60 are respectively connected by tubes 94 and 96 with tubular extensions 98 and 100 extending out from opposite sides of the member 86. The passageway through the extension is controlled by a valve 102 having a stem 104 extending through a guide 105 and part way into the member 86. A coiled spring 106 engaging the valve 102 serves to normally holdy it closed. The passageway through the extension 100 is controlled by a valve 108 hav` ing a stem 1,10 extending through a guide 111 and partway into the member 86. A coiled spring 112 engaging the valve 108 serves to normally hold it closed.

As shown in Figs. 10 and 11, the member 86 is provided with a downward tubular extension 114, the lower end of which. is externally threaded to receive internal threads formed in the upper end of a coupling 116 to the lower end oi' which a reservoir bag 118 is attached, serving for breathing and rebreathing and hereafter referred to as a gas lVithin the coupling 116 there is a valve seat 120 with which al valve 122 is adapted to cooperate. This valve has a downwardly ext-ending stem 124 which is slida le in a tubular projection 126 extending up from the cross bar 128 carried by the lower end ofthe coupling 116. A coiled spring 180 surrounding the stem 124 and interposed between the projection 126 and the lower side of the valve 122 tends to normally hold the valve in open position. A short stem 182 which may be a continuation of the lower stem 124 extends up from the valve 122, the lower portion of the stem 182 being provided with a shoulder 134. A tubular member 186 is slidably mounted on the stem 132, the member 136 merging into a pin 138 at the lower end of which there is a shoulder 140. The pin 188 is slidable in an arm 141 carried by the tubular member 86. A coiled spring 142 is interposed between the valve 122 and the shoulder140, this spring being stiil'erthan the spring 180. The provision of the spring 142 insures closing of the valve 122 when the pin 188 is pushed without liability of the pin becoming jammed and also takes care of wear on the pin so that regardless of wear, thevalve will always be firmly seated when the spring 142 is compressed.

The hollow member 86 is provided with a cover 144 which has a central bearing and packing gland146 as shown in Fig. 4 for a rotatable shank 148 which at its upper end carries a handle 150an-d at an intermediate place carries a pointer 152 which just clears a disk 154 carried by the cover 144. The disk 154 as shown in Fig. 1 is provided with six marks disposed around its periphery and indicated ata, Z1, c, (l, e, and f, the mark c in this ligure being covered by the pointer 152 and the handle 150 which is located above the same. The shank 148 at its lower end carries a cam device designated in general by the numeral 156. This cam device at its upper end is provided with a peripheral cam surface 158 adapted when properly positioned to push rearwardly on the valve stem 90 of the valve 88 which controls the supply of the mixed gases from the mixing chamber. It will be noted from Figs. 4 and 11 that the stem 90 is mounted at a slightly higher level than the stems 104 and 110, these latter stems being at a common level. The cam device just below the cam surface 158 is provided with a second peripheral cam surface 160 adapted to cooperate with either the stem 104 or the stem 110 but only one of them at a time and furthermore only when the cam surface 158 is not engaged with the stem 90. The cam device is capable of rotative movement between the marks a and f on the longer arc connecting these marks. The cam device on its lower end has three downwardly extending cam surfaces 162, 164 and 166 spaced from each other circumferentially and anyone of which is adapted to engage the pin 188 during different rotative positions of the cam device for depressing the valve 122 against the tension of the spring 130 so as to close communication with the gas bag 118.

Extending forwardly from the hollow member 86, there is a tubular projection 168 adapted to be connected'by a tube 170 with an inhaler of well known construction such as a nasal inhaler. Also extending out from the member 86 there is a tubular projection 172 adapted to be connectedby a tube with another inhaler of well known construction such as a mouth inha-ler. is provided with a shutoff cock 174 which when closed prevents passage of gas through this projection. Also connected with the member 86, there is a safety valve device 176. As willbe apparent from'F ig. 7, this device includes a disk 178 resiliently held uponits seat by a spring 180, the tension of which may be varied by turning ascrew cap 182.

' lVith the foregoing description of the details of construction in mind, the operation of the apparatus and device and valves operated thereby will be readily understood. When the rotatable cam device is in the position shown in Figs. 5

and 10, with the pointer 152 in register with the mark c which is the position of the pointer in Fig. 1, the cam surface 158 opensthe Y valve 88 so that a mixture of two gases "such as oxygen and nitrous oxid will pass from the mixing chamber into the hollow member.

86 and out to the inhaler, the valves 102 and 108 now being closed. mixture is permitted to pass into the gas bag 118 since the cam surface 164 is off the pin 138 as shown in Fig. 10 so that the valve 122 is held open by the spring 130. When the The projection 172 especially of the cam- At the same time, the

cam device'isturnedto bring thefpointer 152 into .rgster: with:r the mark? d, the camsurface' 158 is'astill 'inengagement"withthe'stelil s 90``o`f thej'va'lve 88I as shownin'Fig. 6, Abut the `camsurface 164 has engagedjthe pin'138 and" closed the valve 122. The mixture'of the: Y

twolga'ses'can now'passon tothe inlia-ler but cannot pass' intoft'h'elgasbag. Vhen the cam device is= turned to bring they pointer into-v register `withlthemark e, the cam surface 158' hasy moved off -thestemfQQ so closes.

that-the valve 88A' The cam:y surfacet160, however,.hasfif moved into engagement-with the steml1`10 thus openingthe valve 108 7 -so/ that nitrousoxidi alone' can pass tothe inhaler. At the` same time, the pin l' 138 wis 'between'fthe cam surfacesr 162 and 164f'sothat communication `with the gas: bag isl open.

VVhen thecam device is turned .to bring; the Y pointer into re'gisterw-ith the mark f`,-t he cam surface 160 is still'l in engagement With'- with the vvmark Z), the cam surface 160 engages, the stem`104 and opens the 'valve' `102V as shown in=Fig. 9: Oxygen aloneicannow pass tothe rinha'ler since thevalve's88and l108 lare closed;` At the same time, the pin 138 is cam surfaces 164fa'nd 166 so A"that communication with the gas bag isopen. If the cam device is now` turned so as to bring the pointer into register with the mark a, the cam surface 160 still engages the stem 104, but the cam surface 166 has engaged the pin 138 so that communication with the gas bag is shutfo. This position vcorresponds to the position shown in Fig. 8 except that the cam surfaces have been brought to the other side of the hollow member 86.

I claim: l j

1. An anaesthetizing apparatus having a mixing chamber, means for supplying thereto from independent sources of supply a plurality of gases under pressure, hollow member interposed between said mixing chamber and said inhaler, a single rotatable cam device in said hollow member,

a valve tensioned to close the passageway bej the .pin '138 to yclose.y

between thee an inhaler, a

"ferent gases under Y signature.

open position of each of the aforesaid valves.

2. An anaesthetizing apparatus having a mixing chamber, means for supplying thereto from independent sources ofsupply. two difpressure, an inhaler, a hollow member interposed between said mixing chamber and said inhaler, a single rotatable cam device in said hol-low member, a vertically disposed shank to which said cam device 1s secured and by which it may be rotated, a valve tensioned to close the passageway between said mixing chamber and said hollow member, a peripheral cam surface on the upper portion of said cam device for opening said valve, two passageways respectively connecting the sources of gas supply directly with said hollow member, two valves tensioned to close said passageways respectively, asecond peripheral surface on said cam device below said first peripheral cam surface, said last mentioned cam surface being adapted toopen separately either of said last mentioned valves when said rst mentioned valve is in closed position, a gas bag connected with said hollow member by a passageway, a valve in said passageway normally tensioned into open position, and cam surfaces on the lower face of said cam device arranged to close said last mentioned valve and also to permit it to have an open position for the open position of each of the aforesaid valves.

In testimony whereof I hereunto aflix my JAY A. HEIDBRINK. 

